Assuming you are using the jquery-ui grails plugin, it is not included because the current version does not have a directory file under grails-app/assets/jquery-ui . Instead, it uses the web-app directory to put javascript files in a jquery-ui/js subfolder, as you see in the sources .
To get jquery-ui working, you have to put the following line in your directive file:
//= require jquery //= require jquery-ui/js/jquery-ui-1.10.3.custom.min //= require bootstrap
In bootstrap, this works out of the box because they use the directive file in grails-app/assets/javascript , as you see here .
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